Screw fastener



FIG. 1 is a top perspective view of a screw fastener of our new design.

FIG. 2 is a bottom perspective view of the screw fastener of FIG. 1.

FIG. 3 is a front view of the screw fastener of FIG. 1.

FIG. 4 is a left side view of the screw fastener of FIG. 1.

FIG. 5 is a right side view of the screw fastener of FIG. 1.

FIG. 6 is a top view of the screw fastener of FIG. 1; and,

FIG. 7 is a bottom view of the screw fastener of FIG. 1.

The broken lines shown in the Figures are included for the purpose of illustrating portions of the screw fastener and form no part of the claimed design. 

CLAIM The ornamental design for a screw fastener, as shown and described. 